Detachable rosette



BESTAVNLABLE 06F '0. E. DAVIS. DBTAOHABLE ROSETTB.

Patented June 2,1891.

(No Model-.)

BEST AVAlLA'BLE cop" UNITED STATES PATENT OFFICE.

CHARLES E. DAVIS, OF CHICAGO, ILLINOIS.

DETACHABLE ROSETTE.

SPECIFICATION forming part of Letters Patent No. 453,337, dated June 2,1891. Application filed December 31, 1890. Serial No. 376,363. (No model.)

To all whom it hwy concern.-

Be it known that 1, CHARLES E. DAVIS, a citizen of the United States, residing at Ohicago, Illinois, have invented a certain new and useful Improvement in Detachable Rosettes, of which the following is a full, clear, and exact specification.

My invention relates to detachable-rosette fuses that may be used in connection with pendent incandescent electric lamps or other similar devices; and it consists in certain details and methods of construction whereby the liability of the rosette to become detached is reduced and the facility with which it can be operated and manufactured increased. I attainthese objects by mechanism illustrated in the accompanying drawings, in which- Figure 1 shows a plan view of the basepiece of the rosette. Fig. 2 represents a plan view of the cap-piece detached. Fig. 3 is the same as Fig. 1 with certain altered forms of construction. Fig. 4 is a sectional view of the cap-piece, showing a block between the contacts.

Similar letters of reference refer to similar parts throughout the several views.

The base-piece A of the rosette, which may consist of any suitable material, such as wood or porcelain, is depressed at its center, as shown by the shaded lines in Figs.1 and 2 at B. Radial slots are cut in basepiece, into which are inserted the springs B, which consist, preferably, of sheet-metal stamped out and provided at its end with a screw-threaded hole, into which the screw 0 fits. These provide means for attaching to the electric wires or mains. Near these holes are other holes 0, which serve to attach these spring-contacts to the base by a screw. I do not care to limit myself to any particular mode of attaching these contacts to the base. A short distance from the hole 0 the contact is bent over to the side, making an angle of ninety degrees, as shown at D. This part stands edge upward within the depression in the base. This is plainly seen in Figs. 1 and 8. The material from which these contacts are made is preferably elastic, so as to have a springy action. Their tendency may be inward, and when this is so a stop D is sometimes provided, against which the end may -the rim of thesprings from conrest, so as to prevent the The cap E, Figs. 2

tacting with each other. and 4, is also recessed and provided with s'crewterminals for securing the wires G. The plates to which these wires are secured also serve to secure one end of the fuse-wires H, which place the same in electrical communication with the metallic pieces I. These pieces are furnished with screws which serve to hold them in position on the cap, as will readily be seen, and then are bent so as to rise out of the recess, preferably over against each other and in such a manner as to constitute elastic or springy projecting contacts, and at the extreme end are provided with outwardly-projecting lips. (Indicated at 1'.) Between these lips, in Fig. 4, is shown an insulating substance K. This, though valuable for some reasons, is not necessary in all cases for the proper operation of the device. The upward projections form contacts which co-operate with the springs D and are so narrow that when they are placed between the springs they do not connect one to the other; but upon turning them their faces (indicated at I")will come in contact with the springs D and force them outwardly asthey pass around the corner, and upon still further turning will at last rest directly upon the face, as shown in Fig. 3, with the lips I and 1' coming up back of the edges of the springs, which effectually prevents the cap from be ing removed from the base until it has been partially rotated. In so doing it will be withdrawn from contact. To prevent so great a rotation that the cap will again become detached, I in some cases prefer to bend the ends of the springs D, as shown at L. To still further facilitate the operation of the device, I cause a lip M to be formed about the outer edge of the base-piece of the rosette. which rises higher than the other part of th( side wall of the base A. The internal bor of this lip i's suiiicient to take in the ca which guides the same, and especially whil being rotated into position. lIoles are pri vided in the base for the attachment of t1. rosette to the ceiling or other support. conducting-cord which takes the current the translating device, which this rosette adapted to guard by its fuse, is brought int the center of the cap through an aperture, as shown in Fig. 4:.

The value of this detachable rosette consists in the factthat the cap maybe removed and taken from the ceiling down to the floor, where the work of replacing the fuse can be done quicklyand correctly, rather than standing on top of a step-ladder or other uncertain support and performing the delicate operation of replacing the fuse under a great disadvantage.

I do not care to limit myself to the exact details of construction. For instance, I have found that it is not necessary in all cases to provide the lips I I, inasmuch as the friction of the rigid springs D against the surfaces I" I" is sufiicient to hold the capin position. It will also be understood that it is not necessary that the springsD and D should be parallel to each other, as other arrangements of the position would effect the object sought equally as well, especially when considering the fact that the cap is guided effectuall y by the lip upon the edge of the base, as shown in the drawings.

I am aware that prior to my invention detachable rosettes have been constructed and operated; but in most cases they require to be screwed or otherwise laboriously fastened togcther,and in no case whatever,to my knowledge, has the spring action ever been utilized in this manner.

\Vhat I claim as new, and desire to secure by Letters Patent, is-

1. In a detachable rosette, two fiat springs arranged to spring laterally, each being supported at or near one end to the edge of one element of the body of the rosette and protruding toward the interior thereof substantially parallel to each other, and upright fiat contacts mounted upon the other element and adapted to engage the interior surfaces of the springs by being inserted between them and then turned until the contact-surfaces are parallel and in contact with the surfaces of the spring, in combination with laterally-projecting portions upon the upright contacts, adapted to protrude outwardly above the springs when the contact-surfaces engage, substantially as and for the purpose specified.

2. In a detachable rosette, two flat springs arranged to spring laterally, each being supported at or near one end to the edge of one element of the body of the rosette and protruding toward the interior thereof substantially parallel to each other, upright fiat contacts mounted upon the other element and adapted to engage the interim-surfaces of the springs by being inserted between them and then turned until the contact-surfaces are parallel and in contact with the surfaces of the BEST AVAILABLE coP spring, and laterally-projeeting portions upon the upright contacts, adapted to protrude outwardly above the springs when the contactsurfaces engage, in combination with a 011'- cular guide upon one of the elements, substantially as and for the purpose specified.

3. In a detachable rosette, two flat springs arranged to spring laterally, each being supported at or near one end to the edge of the base, being provided with a clamp for the lineqvire at this end and protruding toward the interior thereof substantially parallel to each other, and upright flat contacts mounted upon the cap and provided at the point of mounting with circuit-wire connections and adapted to engage the interior surfaces of the springs bybeinginserted between them and then turned until the contact-surfaces are parallel and in contact with the surfaces of the spring, in combination with laterally-projecting portions upon the upright contacts, adapted to protrude outwardly above the springs when the contactsurfaces engage, substantially as and for the purpose specified.

4. In a detachable rosette, a base provided with'two parallel and opposite yielding flatsurfaeed springs, forming electrical contacts at one end and provided at the other with a portion which is twisted at an angle of ninety degrees thereto and provided with ascrew for the purpose of attaching the line-wire, upright parallel and opposite contacts protruding from the cap, which are centrally located, the width of which is less than the distance apart of the parallel springs attached to the base and their distance apart more than this distance, and circular guiding portions between the base and cap.

5. In a detachable rosette, a base provided with two parallel and opposite yielding flatsurfaced springs, forming electrical contacts atone end and provided at the other with a portion which is twisted at an angle of ninety degrees thereto and provided with a screw for the purpose of attaching the line-wire, upright parallel and opposite contacts protruding from the cap, which are centrally located, the width of which is less than the distance apart of the parallel springs attached to the base and their distance apart more than this distance, and circular guiding portions between the base and cap, in combination with abutting projections engaging the free end of the springs, located upon the base of the rosette, substantially as andfor the purpose specified.

CHARLES E. DAVIS.

Witnesses:

CELESTE 1. CHAPMAN, HARRIET M. DAY. 

